



1, 2, 4, 5, 6, 8, 9, 10, 11, 13, 14, 15, 17, 18, 19, 20, 22, 23, 24, 26, 27, 28, 30, 31, 32, 33, 35, 36, 37, 39, 40, 41, 42, 44, 45, 46, 48, 49, 50, 52, 53, 54, 55, 57, 58, 59, 61, 62, 63, 64, 66, 67, 68, 70, 71, 72, 73, 75, 76, 77, 79, 80, 81, 83, 84, 85
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OFFSET

1,2


COMMENTS

a(n)  a(n1) is in {1,2} for n>=2, and a(n)/n > 2  sqrt(1/22).


LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000


EXAMPLE

As a word, A286922 = 1101110111101110111101110..., in which 1 is in positions 1,2,4,5,6,8....


MATHEMATICA

s = Nest[Flatten[# /. {0 > 1, 1 > {1, 1, 0}}] &, {1}, 7] (* A080764 *)
w = StringJoin[Map[ToString, s]]
w1 = StringReplace[w, {"0" > "01"}]
st = ToCharacterCode[w1]  48 ; (* A286922 *)
Flatten[Position[st, 0]]; (* A286923 *)
Flatten[Position[st, 1]]; (* A286924 *)


CROSSREFS

Cf. A080764, A286922, A286923.
Sequence in context: A285670 A030124 A064318 * A039100 A184482 A141204
Adjacent sequences: A286921 A286922 A286923 * A286925 A286926 A286927


KEYWORD

nonn,easy


AUTHOR

Clark Kimberling, May 17 2017


STATUS

approved



